Balloon-control on false-twist spindle



April 30, 1963 J. J. MERTENS BALLOON-CONTROL ON FALSETWIST SPINDLE 2Sheets-Sheet 1 Filed NOV. 24, 1961 f/A l/ AAA INVENTOR.

JOHAN JACQUES MERTENS ATTORNEY April 30, 1963 J. J. MERTENS 3,087,299

BALLOON-CONTROL ON FALSE-TWIST SPINDLE Filed Nov. 24, 1961 2Sheets-Sheet 2 I NVENTOR Jo/zm Jacques Marie/as TTORNEYS 3,087,299BALLOON-CONTRGL N F ALSE-TWIST SPINDLE Johan J. Mertens, Arnhem,Netherlands, assignor to N.V.

Gnderzoekingsinstitnut Research, Arnhem, Netherlands, a corporation ofNetherlands Filed Nov. 24, 1961, Ser. No. 154,592 Claims priority,application Netherlands Dec. 6, 1960 6 (Zlaims. (Cl. 57-77.3)

This invention relates in general to a thread twisting apparatus andmore particularly to an improved false twisting device of the rotatingtube type.

It is known to impart twist, particularly false twist, to thread by theuse of a rotating tube of the type to which this invention generallyrelates. In utilizing the teachings of the prior art a hollowcylindrical tube is rotatably mounted in bearings which are supportedfrom a stationary housing. The conventional manner of rotating the tubeis by the use of a drive belt which engages a pulley section of theouter periphery of the tube and thus imparts rotation thereto. Near thedischarge end of the tube there is rigidly mounted an encircling body ofa hard material. This body is provided with a bore having an axis normalto the axis of the rotatable tube. The thread passes through thelongitudinal opening in the tube, outward of the tube, longitudinallythrough the bore of the encircling body, one or more times around theoutermost portion of the encircling body and then to conventional feedrollers. The tube is rotated by conventional means and a uniform twistis imparted to the thread fed therethrough. A system of the typedescribed is shown in Patent No. 2,655,781 and a false twister of thetype shown in Patent No. 2,893,198 may be used in such a system.

While the false twisting device described above has been usedcommercially for crimping threads, it has been found that from time totime yarn breakage occurs. Yarn breakage causes long operational delayssince the yarn must be rethreaded through the settling and falsetwisting devices. Furthermore, each time there is a yarn breakage, alength of yarn is drawn off which is not crimped and which musttherefore be later separated from the finished crimped yarn.

It has been very difiicult to ascertain the cause of yarn breakage in asystem of this type because the velocity and tension of the yarn arevery high, but nevertheless, by use of the present invention breakage isgreatly reduced.

It is therefore an object of this invention so to improve false twistingapparatus of the type shown in Patent No. 2,893,198 that the number ofyarn breakages per unit of operating time is greatly decreased.

By use of the present invention, production is interrupted far lessfrequently and there is a corresponding reduction in the number ofinstances when the removal of lengths of uncrimped yarn from finishedcrimped yarn bodies is required.

Other objects and advantages of the invention will be apparent from thefollowing detailed description of a preferred embodiment thereof inconjunction with the annexed drawings, FIGURE 1 of which is a partialsectional view taken along the axis of rotation of a false twistingdevice constructed in accordance with the principles of the presentinvention, and FIGURE 2 is a sectional view of the same device as shownin FIGURE 1 with the jacket 24 bisected to show the position of thethread in relation to the spindle and the jacket.

Referring to FIGURE 1 in greater detail, the false twisting deviceindicated generally by reference numeral is rotatably supported by ballbearings 11 within the core 12 of a stationary housing 13. The housing13 may be attached in any conventional manner to the frame of tent "ice

the thread processing machine (not shown). The false twisting deviceincludes a rotatable body 14 having therethrough an axial bore 15. Aportion of the outer surface of the rotatable body 14 lies withinhousing 13-. This portion is mounted in the bearings 11 for freerotation.

Beyond the housing 13, the body 14 is provided with an integral sheave16 adapted to co-act with a belt 17 by which it is rotated in a mannerknown to the art. A small cylinder 18 of hard material is cemented tothe upper end of the protruding part of the body 14. This cylinder 18 isprovided with an axial bore at 19 and has a fiat external face at 20. Inthe region indicated by the numeral 21 the protruding part of therotatable body 14 is flattened on two sides. It is also provided with atransverse hole at 22 which communicates with the upper end of the bore15. At the point of intersection of the bore 15 with the hole oraperture at 22, there is located a guiding eyelet 23 of a hard material.This eyelet is cemented into an enlarged cavity at the end of the bore15. Tightly fitted over the protruding part of the rotatable member 14,there is a jacket 24. This jacket may be cylindrical. It slides over therounded portion and defines with the flats at 21 two elongated spaces ofsegmental cross-section. One end of the jacket 24 is near the guidingeyelet 23 and the other end is near the bore 19 through the cylinder 18.The cross-section of the jacket 24 is unimportant so long as it allowsspace for the threads between the flats at 21, its own inner wall, andso long as it fits the member 14 snugly.

To commence the use of the device shown in the drawings a thread 25supplied from a conventional twist stop (not shown) is pulled throughthe bore or channel 15 and then twice pulled through the channel 19 sothat the angle of wrap is about 500. The thread 25 is then lead over athread discharge device (not shown). As soon as the thread supply deviceand the thread discharge device have been started and rotation of thefalse twister has been brought about by action of the belt 17, theportion of the thread between the stop and the cylinder 18 is twisted.This twist may, in the case of thermoplastic yarns, be fixed by heatingfollowed by cooling. The twist is removed from the thread in a step inthe process which is accomplished beyond the guide 18. Since thefilaments are fixed in the form of a helical line, a high stretch threadis obtained.

The thread 25 runs inside the jacket 24 which is a sliding fit over thepart of the rotatable body in which the guiding members are located. Thechoice of dimensions is such that it is possible to cement the cylinder18 in position and thereafter to slide the jacket 24 into position. Whenthe jacket 24 is in position the bore of the cylinder 18 isunobstructed, but the jacket nevertheless surrounds the lower portion ofthe cylinder. The jacket 24 has the additional advantage that the threadmay be lead through the bore and subsequently around the wall of theguiding member. A similar advantage is obtained with regard to threadingthe yarn through the bore of the rotatable body when the jacket is nearthat bore.

What is claimed is:

1. A thread twisting apparatus comprising a rotatable body having athread passageway extending axially part way therethrough, an elongatedencircling guiding member of wear-resistant material having a boretherethrough, said member being rigidly mounted on said body adjacentone end thereof and spaced from one end of said passageway with its boreat an angle to said passageway and a sleeve rotating with said body andfrictionally connected to and defining with a portion of said body ayarn passageway of large cross-section between said one end of saidpassageway and an end of said guiding member.

2. A thread twisting apparatus comprising a rotatable body having athread passageway extending axially part way therethrough, an elongatedencircling guiding member of wear-resistant material having a boretherethrough, said member being rigidly mounted on said body adjacentone end thereof and spaced from one end of said passageway with'itsboreat an angle to said passageway and a sleeve defining with a portion ofsaid body a yarn passageway of large cross-section between said one endof said passageway and an end of said guiding member, said sleeve beingslidable onsaid rotatable body and having a cross-sectionalarea adequateto clear said guiding member whereby the sleeve may be applied to the retatable body member by sliding in an axial direction over the guidingmember.

3. A thread twisting apparatus comprising a rotatable body having athread passageway extending axially part way therethrough, an elongatedencircling guiding member of wear-resistant material having a boretherethrough, said member being rigidly mounted on said body adjacentone end thereof and spaced from one end of said passageway with its boreat an angle to said passageway and a sleeve rotating with said body andfrictionally connected to and defining with a portion of said body ayarn passageway of large cross-section between said one end of saidpassageway and an end of said guiding member, said sleeve overlying aportion of said guiding member but 25 body having a thread passagewayextending axially part way therethrough, an elongated encircling guidingmember of wear-resistent material having a bore therethrough, saidmember being rigidly mounted on said body adjacent one end thereof andspaced from one end of said passageway with its bore at an angle to saidpassageway, said body having flat areas between said guiding member andsaid one end of said passageway, a sleeve rotating with said body andfrictionally connected to a portion of said body and overlyingsaid flatareas to define spaces between said one end of said passageway and anend of said guiding member.

5. A thread twisting apparatus as claimed in claim 4 in which the fiatareas are on opposite sides of the rotatable body and intercommunicatethrough a large port which intersects said one end of said passageway.

6. A thread twisting apparatus as claimed in claim 4 in which said oneend of said passageway is defined by a guiding eyelet of hard material.

References Cited in the'file of-this' patent UNITED STATES PATENTS2,855,750 Schrenk et a1 Oct. 14, 1958 2,981,048 Burnell Apr. 25, 1961FOREIGN PATENTS 1,136;4l3' France Dec. 29, 1956

1. A THREAD TWISTING APPARATUS COMPRISING A ROTATABLE BODY HAVING ATHREAD PASSAGEWAY EXTENDING AXIALLY PART WAY THERETHROUGH, AN ELONGATEDENCIRCLING GUIDING MEMBER OF WEAR-RESISTANT MATERIAL HAVING A BORETHERETHROUGH, SAID MEMBER BEING RIGIDLY MOUNTED ON SAID BODY ADJACENTONE END THEREOF AND SPACED FROM ONE END OF SAID PASSAGEWAY WITH ITS BOREAT AN ANGLE TO SAID PASSAGEWAY AND A SLEEVE ROTATING WITH SAID BODY ANDFRICTIONALLY CONNECTED TO AND DEFINING WITH A PORTION OF SAID BODY AYARN PASSAGEWAY OF LARGE CROSS-SECTION BETWEEN SAID ONE END OF SAIDPASSAGEWAY AND AN END OF SAID GUIDING MEMBER.